Signal for mine-railways.



J. A MUIR; SIQNAL FOR MINE RAILWAYS. APPLICATION FILED MAR. 23. I916.

Patented July 30, 1918. f

1SHEETS-SHEET 2.

Witnesses v I Attorneys UNITED STATES PATENT OFFICE.

JOSEPH A. Mom, 01 SMITHBORO, ILLINOIS.

SIGNAL FOR MINE-RAILWAYS. I

Specification of Letters Patent.

Patented July 30, 1918.

Application filed March 23, 1916. Serial No. 86,129. v p

nal system shall be used in connection with a main track having branches or sidings, the sidings leading into cross entries in the mine. Thesystem is actuated by a series of members located adjacent the tracks and adapted to be moved by the wheel of a passing car. It is the object of the invention to provide novel means for actuating signals along the sidings and along the maintrack.

by cars movin along the sidingsand along the main trac in a manner which can be best comprehended when the construction, of the invention and its operation-are thor oughlv understood.

lVith the above and other objects in view which will appear as the description pro-- ceeds. the invention resides in the combine tion and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood .that changes in the precise embodiment of the invention herein disclosed can be made with: in thescope of what isclaimed, without departing from the spirit of the invention. In the accompanying drawing Figure 1 is a diagram illustrating the present signal system; 4 1

Fig. 2- is an elevation showing one of the wheel actuated members;

Figs. 3, 4 and 5 are transverse sections showing the means for mounting thewheel actuated member;

Fig. 6 is an elevation showing one ofthe wheel actuated members in operative relation to the rail;

Fig. 7 is an elevation showing one of the signal boxes; I

Fig. 8 is a section of the signal box;

Fig. 9 is a perspective showing one of the rotatable shafts and its arms.

. Fig. 10 is a side elevationfshowing a slight modification of'the invention; and y I Fig. 11 is a fragmental cross section wherein the structure 10 is viewed ,edgewise for the most part. i

In'the accompanying drawings; and re-.

fer-ring particularly to Fig. 1 therefappears' a main track denoted generally by the "numeral 1 and embodying vrails Qaand 3. Branching off from the main track l is a sid ing at embodyingrails 5' and 6. Branching off fromthe main track 1 in a-direction 0pposite to the siding 4is a siding 7 compr se ingrails-S and 9.

For the actuation of the signals to be described hereinafter, a plurality .of duplicated structures are provided, these struc-- tures being located along the main track 1 and along the sidings 4 and 7. One of these structures will be described in detail, and thereafter the description will be shortened when one of the structures in question is alluded to. I v

Mounted on the under side of the railf2 inadvance of the siding lis a bearing 10, a similar bearing 11 being mounted on "the rail 3. In the bearings .10 and His mounted. for rocking movement a-shaft'12 xtended transversely of the main track 1 and located in advance of the siding 4. The shaft 12 is provided with an upstanding crank arm 14. Mounted on the rail .3 are hangers 15 each comprising a loop-shaped extension 16, the extensions 16 supportingshafts 17. Mounted to swing on the shafts 17 are upright" links 18, the upper ends -of which are pivoted to a wheel actuatedmember or bar 19 disposed closejto the rail 3 and-preferably beveled or inclined at its ends, the construe tion being such that when a' wheel of a vehicle or car traverses the rail '3, the bar19" will be depressed. The upper end of the crank armleton the shaft 12 is pivoted to' the bar 19 intermediate the ends of-the bar and consequently, when the bar 19 is'mo'ved endwise in one direction or the oth'enthef upstanding arm 20 and with a fixed depending arm 21. Oppositely extended retractile springs 22 are provided, the inner ends of these springs being connected with the upper end of the arm 20 and the outer ends of the springs being connected as shown at 23 to a fixed support of some sort which may be the rail 3. The springs 22 serve to assist in rotating the shaft 12 and, through the medium of the upstanding crank arm 14-, aid in elevating the bar 19, when the latter is being reset to wheel engaging position.

The springs 22, and similar springs hereinafter described are not sufficiently strong to return the signals together with their connected operating mechanisms to safety-in dicating position, on account of friction and on account of the weight of various moving parts. The signals and their operating mechanisms will be described in detail as the description progresses.

The structure above described is duplicated at various points through the signal system, and hereinafter, allusion will be made merelyto the bar, represented by the bar 19, the shaft, such as the shaft 12, and the arms, as, for instance, the arms 20 and 21, it being understood that the structural details hereinbefore described are retained.

Disposed adjacent the siding a is a support 24 carrying a casing 25 adapted to contain a lamp 26 shown in Fig. 8. Signals or slides 27 and 28 are mounted to reciprocate in the casing 25, the slides 27 and 28 being provided with plates 29 which preferably show red. It will now be obvious that if either of the slides 27 and 28 is pushed inwardly with respect to the casing 25, a car coming down the siding 4: in the direction of the arrow F will encounter a red or danger signal.

Located opposite to the siding 41 is a casing 31, constructed like the casing 25, but provided with a single slide 32 of the sort hereinbefore described.

Disposed adjacent the siding 7 is a casing 33 which, like the casing 25, carriestwo slides 34 and 35. The numeral 36 indicates a shaft, like the shaft 12, disposed transversely of the siding 4, and adapted to be rocked by a wheel actuated bar 37, like the bar 19. The shaft 36 is provided with an upstanding arm 38 and with a depending arm 39. A shaft 40 is mounted to rock transversely of the track 1 and is controlled by a wheel actuated bar 11, the shaft 10 having an upstanding arm 42 and a depending arm 43. Another shaft 14 is disposed transversely of the track 1 and is mounted to rock, the shaft 44: being controlled by a wheel actuated bar 15. The shaft 44 is sup plied with an upstanding arm 46 and with a depending arm f17. A shaft 18 is disposed transversely of the main track 1 near the siding 7 and is rocked by a wheel actuated bar a9. The shaft -18 is provided with an upstanding arm 50 and with a depending arm 51. Arranged transversely of the siding 7 is a shaft 72 adapted to be rocked by a Wheel actuated bar 73. The shaft 72 is supplied with an upstanding arm 74 and with a depending arm 75.

A vertical shaft 52 is mounted to rotate adjacent the casing 25, the shaft being provided with oppositely projecting arms 53 and 54:, and with a forwardly presented arm 55. The shaft 52 and its arms, constitute, in effect, as will be manifest when the description is proceeded with, a three-armed lever. A vertical shaft 59 is mounted near the casing 25, the shaft 59 being rovided with oppositely extended arms 60 and 61 and with a rearwardly projecting arm 62. Disposed near the casing 31 is a vertical shaft 56 having angularly disposed arms 57 and 58. Arranged near the signal casing 33 of the siding 7 is a vertical. shaft 63 provided with oppositely projecting arms 64 and 65 and with an arm 66 which extends toward the main track 1. A vertical shaft 67 is located near the signal casing 33 and is provided with oppositely projecting arms 68 and 69, and with a rearwardly projecting arm 70.

Located adjacent the main track 1 near to the siding 4 is a bell crank71 having angularly disposed arms 77 and 78. Located near to the bell crank 71 is a bell crank 79 having arms 80 and 81. The arms 77 and 81 of the bell cranks/T1 and 79 project in a common direction, whereas the arms 7 8 and 80 of the bell cranks project in opposite directions. Located near to the bell crank 7 9 is T-lever' 82 comprising oppositely extended arms 83 and 84, and an arm 85 which projects in the same direction as the arms 81 and 77 of the bell cranks. Located near to the T-lever 82 is a T-lever 86 including arms 87 and 8S and a shank or arm 89 projecting in the same direct-ion as the shank or arm '85 of the T-lever 82. Disposed near the siding 7 is a bell crank 90 comprising arms 91 and 92. The numeral 93 designates a bell crank located near to the bell crank 90 and including arms 91 and 95. The arms 92 and 95 of the bell cranks 90 and 93 project in a common direction, the arms 94; and 91 of the bell cranks projecting in opposite directions. The numeral 96 designates a T-lever including oppositely projecting arms 97 and 98 and a shank 99. A T-lever 100 is shown, the T-lever including oppositely projecting arms 101 and 102 and a shank 103, the shank 103 of the T-lever 100 extending in the same general direction as the shank 99 of the T- lever 96. The numeral 104C denotes a lever of the first order fulcrume'd intermediate its ends as shown at 105 and mounted to swing in a horizontal plane, the lever 104 being located between the T-lever 100 and the shaft 48.

A rigid connection 106 unites the arm of the vertical shaft 52 with the signal slide 27 of the casing 25. A rigid connection 107 unites the arm 62 of the vertical shaft 59 with the signal slide 28 of the casing 25. A rigid connection 108 unites the arm 58 of the vertical shaft 56 with the slide or signal 32 of the casing 1. A rigid connection 109 unites the arm of the vertical shaft 67 with the slide 34 of the casing A rigid connection 110 unites the arm66 of the vertical shaft 63 to the slide 35 of the casing 33. Although these various connections have been described as rigid, it is to be understood that they are pivoted to the'parts wherewith they coact.

The invention includes a plurality of flexible elements which will now be described.

These flexible elements may be fashioned in any desired manner, but to simplify the de- I scription, it will be presupposed that they are wires, it being understood that in using the word wire no other suitable form of connection is excluded. I

A wire 111 connects the upstanding arm 20 of the shaft 12 with the arm 57 of the uprightshaft 56. which is located adjacent thesignal casing 31. A wire 112 unites the upstanding arm 20 of the shaft 12 with the shank'85 of the T-lever 82. 'A wire 114 unites the depending arm 21 of the shaft 12 with the shank 89 of the T-lever 86. V A wire 116 unites the depending arm 39 of the shaft 36 on the siding 4 with the arm of the bell crank 79. A wire 115 unites theupstanding arm 38 of the shaft 36with-the arm 78 of the bell crank 71; A wire 117' unites the ar1n57 of the vertical shaft 56 with the arm 81 of the bell crank79. A wire 118 unites the arm 77 of the bell crank 71 with the arm 95 of the bell crank 93. A 'wire119 unites the arm 81 of the bell crank 79 with the arm 92 of the bell crank 90l A wire 120 unites the depending arm 43 of theshaft 40 A wire 121 unites the upstandingfarm 42 of the shaft 40 with the shank 89 of the lever "86' A wire 122 unites the ar1n83 of the T-lever with the shank of the T-lever 82.

82 with the arm 54 ofthe vertical shaft 52 which ,is located adjacent the signal casing 25. shaft with the arm'84 .of the T-lever 82. A wire-124 unites the arm 61 of the'vertical shaft 59 with the arm 87'of theT-lever 86. A wire 125 unites the arm 60 ofthevertical shaft 59 with the arm 88 of the T-lever 86. A wire 126 unites theshank 8 9 of the T-lever 86 with the shank 103 of the T-lever 100. j A

wire 127 unites the upstanding arm 46 of the shaft 44 withthe shank 99 of the T-lever 96.

A wire 128 unites the depending arm 47 0f.

A wire 123 unites the arm 53 of the.

93. A wire 131 unites the arm 95 of the bell cranklever 93 with one end of thelever'104, which, it is to be recalled, is a lever of the first order. A wire 132 unites the other end of the lever 104 with the shank 103 of the T-lever 100. A wire 133 unites the upstanding arm 50. of the shaft 48with the shank 103 of the T lever 100. A wire 134--unites the depending. arm 51 of the shaft 48 with the shank 99 of the T-lever 96. A wire 135 unites the arm 101 ofthe' T-lever 100' with. the arm 69'on the vertical shaft 67 located adjacent the signal casing 33. A wire 136 unites the arm 68 ofthe shaft 67 with'the' arm 102 of the ,T-lever 100. -A;wire 137 connects the arm 65 of-the vertical shaft 63 I which islocated near to the'casi1ig;33, :with

the arm 98' of the T-lever 96. Awiref 138 connects the arm 64 of the shaft 632150 the arm 97'of the T-lever 96. t

is as follows The practical operation of the structure Suppose that a car is moving along-the' being rotatedby means of the arm60. mThe.

arm 62fonthe shaft 59.tlirough themedium of the 'rigid connection ,107, advances: the

slide or signal. 28' in the-signal .casing25 so that. a red light is shown against abar mov ing down the siding-'4 in the direction of therarrow F. Vvhen the shank 89 ofthe T-leverf86 is swung, as hereinbeforedeg scribed by the action'of the wire-114, a. pull is exertedon the wire'126, the wire .126 swinging the T-lever 100 by means of the shank 103.- Thearm 102 of the ;T-rlever 100 exerts a, pull on the 'wire3'6, anduthe -wire 136 by means of the arm .68 rotates. the' shaft 67, the arm 70 of \i'hicheXerts a thrustagainst the rigid connection 109, the econing in the direction ,ofthe arrow D onthe siding-7. Cars onuboth of the sidings4 and 7 ,thus are confrontedby, danger or cant-ion signals indicating that a car is; proceeding along the main track '1'.

Supposeathatthe :car proceeds along the; maintrack 1 in thedirection. of the arrow; r

'. 125 7 bar 41. Then the shaft 40 isrocked, and A A until one vwheel of, thecar, engages the the arm 42 of the shaft 40,exertsapull on thewire .121, the wire 121i swingingnthe T- r nection 109 advancingjthe; slide 34 so that a red light is shown against the car proceed v lever 86 by means of the shank 89. Thereupon, the arm 87 of the T-lever 86 exerts a pull on the wire 124, rotating the shaft 59 through the medium of the arm 61, the arm 62 on the shaft 59 exerting a pull on the connection 107, the connection 107' withdrawing or retracting the slide 28. Thereupon a white light is disclosed to a car proceeding in the direction of the arrow F along the siding 4, thereby indicating that the car moving along the track 1 has passed the siding 4.

The car, moving along the main track 1 in the direction of the arrow A, engages the bar 45 and rocks the shaft 44. The arm 47 takes the slack out of the flexible element 128 but operates no signal, the flexible element 128 being a resetting wire for the bar 45.

Finally, the car, proceeding in the direc tion of the arrow A along the main track 1, operates the bar 49 which, in turn, rocks the shaft 48, the arm 50 of the shaft 48 pulling the wire 133. The wire 133 rocks the T-lever 100 by means of the shank 103, whereupon the arm 101 of the T-lever 100 exerts a pull on the wire 135, the wire 135 rotating the shaft 67 by means of the arm 69, whereupon the arm 70 will exert a pull upon the connection 109, the connection 109 exerting a pull upon the signal slide 34 and retracting it, thereby showing to a car pro ceeding 1n the direction of the arrow D along the siding 7, that the car moving on the main track 1 in the direction of the arrow A has passed the siding 7.

Now let it be supposed that a car is moving along the main track 1 in the direction of the arrow B.- The car coiiperates with the bar 49 and rocks the shaft 48. The arm 51 exerts a pull on the wire 134, and the wire 134 swings the T-lever 96 by means of the arm 99. The arm 98 of the T-lever 96 exerts a pull on the wire 137, the wire 137 rotating the shaft 63 through the medium of the arm 65. The arm 66 on the shaft 63 exert-s a thrust against the connection 110 and the connection 110 advances the signal 35, thus showing red against the car moving in the direction of the arrow D on the track 7.

The car, moving along the track 1 in the direction of the arrow B cotiperates with the bar 45 and rocks the shaft 44. The arm 46 011 the shaft 44 exerts a pull on the wire 127, and the wire 127 swings the T-lever 96 by means of the shank 99. The arm 97 of the T-lever 96 exerts a pull on the wire 138 and rotates the shaft 63 by means of the arm 64, the arm 66 on the shaft 63 retracting the signal 35 through the medium of the connection 110. A white light is now shown to a car moving inthe direction of the arrow D, on the siding 7 and the operator of such a car is advised that the car moving along the track 1 has passed the siding 7 The car moving along the track 1 in the direction of the arrow B co5perates with the bar 41 and rocks the shaft 40. r The arm 43 of the shaft 40 exerts a pull on the wire 120 and the wire 120 swings the T-lever 82 by means of the arm 85. The arm 83 of the T-lever 82 pulls on the wire 122 and the wire 122 rotates the shaft 52 by means of the arm 54. The arm 55 on the shaft 52 operates the signal 27, through the medium of the connection 106, indicating to a car proceeding in the direction of the arrow F along the siding 4, that a car moving along the track 1 in the direction of the arrow B is approaching the siding 4.

The car moving in the direction of the arrow B on the track 1 co6perates with the bar 19, rocking the shaft 12. The arm 20 on the shaft 12 exerts a pull on the wire 112. The wire 112 swings the T-lever 82 by means of the arm 85. The arm 84 of the T-lever 82 exerts a pull on the wire 123 and the wire 123 rotates the shaft 52 through the medium of the arm 53. The arm 55 of the shaft 52 exerts a pull on the connection 106 and the connection 106 retracts the slide or signal 27, thus indicating to a car moving in the direction of the arrow F along the siding 4, that the car on the main track 1 and moving in the direction of the arrow B has passed the siding 4.

Now let it be supposed that a car is pr0- ceeding along the main track 1 in the direction of the arrow A. The bar 19 and parts associated therewith advance the signal 28 as before, showing red against a car moving in the direction of the-arrow F along the siding 4. In the manner hereinbefore described, the slide 34 of the casing 33 is advanced to show red against a car coming in the direction of the arrow D along the siding 7. Suppose that the car proceeding in the direction of the arrow A along the track 1 turns into the siding 4, in the direction of the arrow E. Then, the car engages the bar 37 and the latter rocks the shaft 36.

The arm 38 of the shaft 36 exerts a pull on the wire 115 and the wire 115 swings the bell crank lever 71 by means of the arm 78. The arm 77 of the bell crank lever 71 exerts a pull on the wire 118, and the wire 118, cooperating with the wire 131, swings the lever 104 on its fulcrum 105. The lever 104 exerts a pull on the .wire 132. Thus the T-lever 100 is swung by means of the shank 103. The arm 101 of the T lever 100 exerts a pull on the wire 135, the latter rotating the shaft 67 by means of the arm 69, the arm 70 on the shaft 67 exerting a pull on the connection 109, and the connection 109 retracting the slide or signal 34. It is now made the siding 4.

manifest to a car proceeding in the direction of the arrow D along the siding 7, that the main track 1 is clear.

When the T-lever 100 is swung in the manner hereinbefore set forth, the shank 103 of the T-lever 100 exerts a pull on the wire 126, the latter swinging the lever 86 by means of its shank 89, the arm 87 of the T-lever 86 exerting a pull on the wire 124, the wire 124 rotating the shaft 59 by means of the arm 61, the arm 62 on the shaft 59 exerting a pull on the connection 107, and the slide or signal 28 being retracted, it being recalled that the signal 28 was previously advanced by the car. moving in the direction of the arrow A along the track 1, when the said car operated the bar 19 before the car had turned into the siding4.

Suppose that a car 1 moving along the track 1 in the direction of the arrow A passes by the siding 4. This car first'actuates the bar 19 and the shaft 12 and thus the signal 28 is advanced, and the signal34 is advanced also. The car, moving in the direction of the arrow A along the track 1 ultimately operates the bar 41, the bar 41 rotates the-shaft 40 and the arm 42 pulls on the wire 121, the T-lever 86.being tilted by the arm 89, the arm 87 of the T-lever exerts a pull on the wire 124, the shaft 59 being r0- tated by the arm 61, and the arm 62 retracting the slide or signal 28 through the medium of the connection 107. It is now evident, as before to a car proceeding in the direction of the arrow F along the siding 4, that the main track 1 is clear, to the left of The car,moving ,in the direction of the arrow A along the track 1, operates the shaft 44 through the medium of the bar 45. The arm 47 on the shaft 44 takes the slack out'of the wire 128, the signal 34 being already in an advanced position with respect to the casing 33. If the car moving on themain track 1 in the direction of the arrow A. turns into the siding 7 and moves alongthe siding 7 in the direction of the arrow C, the bar 7 3 imparts rockingmovement to the shaft 72 and the arm 74 on the shaft 72 exerts a pull on the wire 130 and tilts the bell crank lever 93 by means of the arm 94. The arm 95 of the lever 93 exerts a pullon the wire, 131, and the wire 131 tilts the lever 104 on its fulcrum 105. 'A' pull is.

thus exerted on the wire .132 and the wire 132 swings the lever 100 by means of the shank 103. The arm 101 of the T-lever 100 exerts a pull on the wire 135 and thus the shaft 67 is rotated by means of the arm 69. The arm 70 of the shaft 67 exerts a pull on the connection 109. and the-slide 34 is retracted.

Suppose that a car is coming out of the siding in the direction ofv the "arrow F.

The car actuates the bar 37 rocking the 117 rotates the shaft 561by means of the arm 57 The arm 58'of the shaft 56 advances the slide 32 through themedium of the connection 108 v From the signal casing 31 there is exhibited a red light, indicating to a car on the main track 1 that, a car 13 comingout of one of the sidings.

Let it be supposed that the can after leaving the siding 4 moves along thefmain track 1 in the direction of the arrow 13.. The

car then operates the bar 19 and rotates the shaft 12; The arm 20 on the shaft12 exerts a pull on the wire 111, as shown by'the, ar-

means of the arm 57. Thearm 58-.on the shaft 56 exerts a pull on the connection 108,

sothat the signal slide 32 of'the casing" 31 is retracted, to show a white light,

Suppose that a car 1s coming out of the siding 7 in the direction ofthe arrow D.

The caroperates the shaft 72by means of the bar? 3 and the arm 75 on the shaft 72 exerts a pull on the wire 129, thewire 129 operating the bell crank lever by means ofthe arm 91. The arm 92 of the bell crank lever 90 exerts a pull on the wire 119, the wire 119 exerts a pull on the wire 117, the wire 117 rotating the shaft 56 by means of row in Fig. 1, and'the shaft 5,6 is'rotated by the arm 57, the arm 58 on the shaft 56 advancing the slide 32 by means of the connection 108 thus showing red at the signal casing 31 to a car moving along the main ings.

If the car on the siding 7, moving in the direction of the arrow D, passes out onto the main track 1 and traverses the main track 1 invthe direction of the arrow B, then the car rotates the shaft44 through'the medium track 1 and indicating to sucha car that. another car is moving out of one of the sidof the bar 45. "The arm 46 on the shaft 44 exerts a pull upon the wire 127, the wire 127 exerts a pull on the wire 134, the arms 51 and 50 are rocked, the arm 50pulling on the wire 133, the wire 133 pulling the wire wire 114 rocking the arms 21and 20 on the the wire 111, the shaft 56 being rotated by 126, .the' wire 126 pullingthe wire 1114, the i meansof the arm 57 and the arm 58 onthe I shaft 56 exerting a pull on the connection 108 which, in its turn will retractthe signal By way of rsum v y when a car is moving in the directionof the arrow Aon thetrackl, the bar 19 first movesthe signals 28 and 34v to danger india mayb stated-that cating position; the bar 41 then moves the signal '28 to safety indicating positlon and finally the bar 49 moves the signal 34 to safety indicating position.

When the car is moving in the direction of the arrow B along the main track 1, the bar 49 moves the signal 35 to danger indicating position, the bar 45 moves the signal 35 to safety indicating posit-ion, the bar 41 moves the signal 27 to danger indicatin position, and the bar 19 moves the signal 27 to safety indicating position.

Before the car enters the siding 4, the bar 19 will throw the signals 28 and 34 to danger indicating positions, and after the car is in the siding 4, the bar 37 moves the signals 28 and '34 to safety indicating positions. 7

As the car moves along the main track 1 in the direction of the arrow A, the bar 19 moves the signals 28 and 34 to danger indicating positions, the bar 41 moves the signal 28 to safety indicating position, and when the car enters the siding 7, the bar 73 moves the signal 34 to safety indicating position.

When the car moves out ofthe siding 4 onto the main track, the bar 37 throws the signal 32 to danger indicating position, and after the car is on the main track, the bar 19 moves the signal 32 to safety indicating position.

When the car moves out of the siding 7 onto the main track, the car, through the medium of the bar 73, throws the signal 32 to danger indicating position, and after the car is on the main track, the bar 45 throws the signal 32 to safety indicating position.

For convenience in claiming the invention, the same may be described briefly as comprising a main track 4, a first car actuated member 19 on the main track, a second car actuated member 49 on the main track, a first siding 4 and a second siding 7 branching from the main track between the car actuated members 19 and 49, a third car actuated member 41 located on the main track between the sidings, a fourth car actuated member 45 located on the main track between the sidings, a first signal 28 on the first siding 4, a second signal 27 on the first siding 4, a first signal'34 on the second siding 7, and a second signal 35 on the second siding 7.

I In Figs. 10 and 11, a slight modification of the invention is shown. In the said figures, the rail appears at 276 and carries a bearing 277 in which is journaled a shaft 278 corresponding to the shafts 12, 36, 40, 44, 48 and 72. The shaft 278 is provided with an arm 279 corresponding, for instance, to the arm 20. The numeral 280 indicates an arm corresponding to the arm '21, the arm 280 being pivoted as shown at 281 to the bracket 282 on the rail 27 6. At 283 there appears a diagonal link, the upper end of which is pivoted at 284 to the arm 279, the lower end of the link 283 being pivoted as shown at 285 to the arm 280 below the pivotal mounting 281. A casual inspection of Fig.. 10 will make it evident that the functions of the arms 279 and 280 are the same as those of the arms 20 and 21, it being possible to substitute the structure shown in Fig. 10 for the structure shown at 20 and 21, and elsewhere in Fig. 1, without departing from the spirit of the invention and without e'opardi'zing its utility.

The specific advantage attendant upon the use of the structure shown in Fig. 10 is that it permits the actuating wires, of which the wires 112 and 114 may be taken as typical, to be elevated. The parts18, 14 and 19 are used in connection with this form of the invention. 7

Having thus described the invention, what is claimed is 1. In a railway signal system, a main track; first, second, third and fourth car 'ac- M tuat'ed members on the main track; a first siding branching from the main track between the first and third car actuated members; a second siding branching from the main track between the second and fourth car actuated members; a signal on the first siding; a first screen and a second screen movable with respect to said signal; a signal on the second siding; a third screen and a fourth screen movable with respect to the last specified signal; a mechanical means connecting the first car actuated member with the second screen and with the third screen to advance the same; a mechanical means connecting the third 'car actuated member with the second screen to retract the latter; a mechanical means connecting the second car actuated member with the third screen to retract the same; a mechanical means connecting the second car actuated member with the fourth screen to advance the same; a mechanical means connecting the fourth car actuated member with the fourth screen to retract the latter; a mechanical means connecting the third car actuated member with the first screen to advance the latter; a mechanical means con necting the first car actuated member with the "first screen to retract the latter; a fifth car actuated member on the first siding; a sixth car actuated member on the second siding mechanical connections between the fifth car actuated member and the second and third screens to retract the same; and

a mechanical connection between the sixth the single screen to advance the latter; a

with a third signal located adjacent the juncture of the first siding and the main track; a single screen movable with respect to the third signal; a mechanical means connecting the fifth car actuated member with mechanical means connecting the fourth car actuated member with the single screen to retract the latter.

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses. mechanical means connecting the first, car actuated member with the single screen to JOSEPH A. MUIR. retract the latter; mechanical means connecting the sixth car actuated member with the single screen to advance the latter; and

Witnesses: H. Scmnm,

C. J. WOLFMILLER.

Copies 8! thil patent may be obtained for an centl each, by addressing the "Commissioner of'htentu Washington, D. Q. 

